Peavy rage158
Peavy rage158
What is the output voltage for the power transformer. The part # is 705-28729. The transformer is bad, discontinued and Peavy won't give me the information to locate one aftermarket....
Re: Peavy rage158
What is the wrong with the transformer you have?
>>>>>>>>>>>
The main power supply voltage is +28 Vdc. The voltage from the xformer secondary is rectified by a full wave bridge and stored on a large value filter cap. This is essentially the peak voltage. So what is the rms voltage on the secondary of the xformer. It’s 28 Vpk x .707 = ?
You can use a calculator. I’ll use my slide rule. I get about 20 V, which would be the secondary voltage.
On the back of the amp, is says 40 Watts as the power consumption. Due to the equilibrium of power in a transformer, Pwr pri = Pwr sec, the secondary current would be (using formula: Pwr = Voltage * Current), solving for current,,,,,, slide rule says 2 amps. (40 Watts/20 Volts = 2 Amps).
Does this help and does it sound right? You got to get the right size part.
Maybe you can find an old Rage that’s broken and use that transformer.
https://www.thetubestore.com/lib/thetub ... ematic.pdf [/url]
>>>>>>>>>>>
The main power supply voltage is +28 Vdc. The voltage from the xformer secondary is rectified by a full wave bridge and stored on a large value filter cap. This is essentially the peak voltage. So what is the rms voltage on the secondary of the xformer. It’s 28 Vpk x .707 = ?
You can use a calculator. I’ll use my slide rule. I get about 20 V, which would be the secondary voltage.
On the back of the amp, is says 40 Watts as the power consumption. Due to the equilibrium of power in a transformer, Pwr pri = Pwr sec, the secondary current would be (using formula: Pwr = Voltage * Current), solving for current,,,,,, slide rule says 2 amps. (40 Watts/20 Volts = 2 Amps).
Does this help and does it sound right? You got to get the right size part.
Maybe you can find an old Rage that’s broken and use that transformer.
https://www.thetubestore.com/lib/thetub ... ematic.pdf [/url]
Re: Peavy rage158
Not trying to insult you, but how did you determine the transformer is bad?
The more I learn the more I realize how much I don't know.